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Thx for this question, I didn't know how tar behaves in that situation. It seems to me, that in case the archive is stdout, tar outputs all other information on stderr. So here you go for logging to backup-tar.log:

thanks! thats what I need, but there is a parameter that is also useful "--totals". This parameters let me see the total size: Total bytes written: 22732800 (22MiB, 17MiB/s)
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magiza83Nov 23 '12 at 10:41